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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/affs/file.c | |
3 | * | |
4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
5 | * | |
6 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. | |
7 | * | |
8 | * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. | |
9 | * | |
10 | * (C) 1991 Linus Torvalds - minix filesystem | |
11 | * | |
12 | * affs regular file handling primitives | |
13 | */ | |
14 | ||
15 | #include "affs.h" | |
16 | ||
17 | #if PAGE_SIZE < 4096 | |
18 | #error PAGE_SIZE must be at least 4096 | |
19 | #endif | |
20 | ||
21 | static int affs_grow_extcache(struct inode *inode, u32 lc_idx); | |
22 | static struct buffer_head *affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext); | |
23 | static inline struct buffer_head *affs_get_extblock(struct inode *inode, u32 ext); | |
24 | static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext); | |
1da177e4 LT |
25 | static int affs_file_open(struct inode *inode, struct file *filp); |
26 | static int affs_file_release(struct inode *inode, struct file *filp); | |
27 | ||
4b6f5d20 | 28 | const struct file_operations affs_file_operations = { |
1da177e4 | 29 | .llseek = generic_file_llseek, |
543ade1f BP |
30 | .read = do_sync_read, |
31 | .aio_read = generic_file_aio_read, | |
32 | .write = do_sync_write, | |
33 | .aio_write = generic_file_aio_write, | |
1da177e4 LT |
34 | .mmap = generic_file_mmap, |
35 | .open = affs_file_open, | |
36 | .release = affs_file_release, | |
37 | .fsync = file_fsync, | |
5ffc4ef4 | 38 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
39 | }; |
40 | ||
754661f1 | 41 | const struct inode_operations affs_file_inode_operations = { |
1da177e4 LT |
42 | .truncate = affs_truncate, |
43 | .setattr = affs_notify_change, | |
44 | }; | |
45 | ||
46 | static int | |
47 | affs_file_open(struct inode *inode, struct file *filp) | |
48 | { | |
49 | if (atomic_read(&filp->f_count) != 1) | |
50 | return 0; | |
dca3c336 RZ |
51 | pr_debug("AFFS: open(%lu,%d)\n", |
52 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); | |
53 | atomic_inc(&AFFS_I(inode)->i_opencnt); | |
1da177e4 LT |
54 | return 0; |
55 | } | |
56 | ||
57 | static int | |
58 | affs_file_release(struct inode *inode, struct file *filp) | |
59 | { | |
60 | if (atomic_read(&filp->f_count) != 0) | |
61 | return 0; | |
dca3c336 RZ |
62 | pr_debug("AFFS: release(%lu, %d)\n", |
63 | inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt)); | |
64 | ||
65 | if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) { | |
66 | mutex_lock(&inode->i_mutex); | |
67 | if (inode->i_size != AFFS_I(inode)->mmu_private) | |
68 | affs_truncate(inode); | |
1da177e4 | 69 | affs_free_prealloc(inode); |
dca3c336 RZ |
70 | mutex_unlock(&inode->i_mutex); |
71 | } | |
1da177e4 LT |
72 | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static int | |
77 | affs_grow_extcache(struct inode *inode, u32 lc_idx) | |
78 | { | |
79 | struct super_block *sb = inode->i_sb; | |
80 | struct buffer_head *bh; | |
81 | u32 lc_max; | |
82 | int i, j, key; | |
83 | ||
84 | if (!AFFS_I(inode)->i_lc) { | |
85 | char *ptr = (char *)get_zeroed_page(GFP_NOFS); | |
86 | if (!ptr) | |
87 | return -ENOMEM; | |
88 | AFFS_I(inode)->i_lc = (u32 *)ptr; | |
89 | AFFS_I(inode)->i_ac = (struct affs_ext_key *)(ptr + AFFS_CACHE_SIZE / 2); | |
90 | } | |
91 | ||
92 | lc_max = AFFS_LC_SIZE << AFFS_I(inode)->i_lc_shift; | |
93 | ||
94 | if (AFFS_I(inode)->i_extcnt > lc_max) { | |
95 | u32 lc_shift, lc_mask, tmp, off; | |
96 | ||
97 | /* need to recalculate linear cache, start from old size */ | |
98 | lc_shift = AFFS_I(inode)->i_lc_shift; | |
99 | tmp = (AFFS_I(inode)->i_extcnt / AFFS_LC_SIZE) >> lc_shift; | |
100 | for (; tmp; tmp >>= 1) | |
101 | lc_shift++; | |
102 | lc_mask = (1 << lc_shift) - 1; | |
103 | ||
104 | /* fix idx and old size to new shift */ | |
105 | lc_idx >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
106 | AFFS_I(inode)->i_lc_size >>= (lc_shift - AFFS_I(inode)->i_lc_shift); | |
107 | ||
108 | /* first shrink old cache to make more space */ | |
109 | off = 1 << (lc_shift - AFFS_I(inode)->i_lc_shift); | |
110 | for (i = 1, j = off; j < AFFS_LC_SIZE; i++, j += off) | |
111 | AFFS_I(inode)->i_ac[i] = AFFS_I(inode)->i_ac[j]; | |
112 | ||
113 | AFFS_I(inode)->i_lc_shift = lc_shift; | |
114 | AFFS_I(inode)->i_lc_mask = lc_mask; | |
115 | } | |
116 | ||
117 | /* fill cache to the needed index */ | |
118 | i = AFFS_I(inode)->i_lc_size; | |
119 | AFFS_I(inode)->i_lc_size = lc_idx + 1; | |
120 | for (; i <= lc_idx; i++) { | |
121 | if (!i) { | |
122 | AFFS_I(inode)->i_lc[0] = inode->i_ino; | |
123 | continue; | |
124 | } | |
125 | key = AFFS_I(inode)->i_lc[i - 1]; | |
126 | j = AFFS_I(inode)->i_lc_mask + 1; | |
127 | // unlock cache | |
128 | for (; j > 0; j--) { | |
129 | bh = affs_bread(sb, key); | |
130 | if (!bh) | |
131 | goto err; | |
132 | key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
133 | affs_brelse(bh); | |
134 | } | |
135 | // lock cache | |
136 | AFFS_I(inode)->i_lc[i] = key; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | ||
141 | err: | |
142 | // lock cache | |
143 | return -EIO; | |
144 | } | |
145 | ||
146 | static struct buffer_head * | |
147 | affs_alloc_extblock(struct inode *inode, struct buffer_head *bh, u32 ext) | |
148 | { | |
149 | struct super_block *sb = inode->i_sb; | |
150 | struct buffer_head *new_bh; | |
151 | u32 blocknr, tmp; | |
152 | ||
153 | blocknr = affs_alloc_block(inode, bh->b_blocknr); | |
154 | if (!blocknr) | |
155 | return ERR_PTR(-ENOSPC); | |
156 | ||
157 | new_bh = affs_getzeroblk(sb, blocknr); | |
158 | if (!new_bh) { | |
159 | affs_free_block(sb, blocknr); | |
160 | return ERR_PTR(-EIO); | |
161 | } | |
162 | ||
163 | AFFS_HEAD(new_bh)->ptype = cpu_to_be32(T_LIST); | |
164 | AFFS_HEAD(new_bh)->key = cpu_to_be32(blocknr); | |
165 | AFFS_TAIL(sb, new_bh)->stype = cpu_to_be32(ST_FILE); | |
166 | AFFS_TAIL(sb, new_bh)->parent = cpu_to_be32(inode->i_ino); | |
167 | affs_fix_checksum(sb, new_bh); | |
168 | ||
169 | mark_buffer_dirty_inode(new_bh, inode); | |
170 | ||
171 | tmp = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
172 | if (tmp) | |
173 | affs_warning(sb, "alloc_ext", "previous extension set (%x)", tmp); | |
174 | AFFS_TAIL(sb, bh)->extension = cpu_to_be32(blocknr); | |
175 | affs_adjust_checksum(bh, blocknr - tmp); | |
176 | mark_buffer_dirty_inode(bh, inode); | |
177 | ||
178 | AFFS_I(inode)->i_extcnt++; | |
179 | mark_inode_dirty(inode); | |
180 | ||
181 | return new_bh; | |
182 | } | |
183 | ||
184 | static inline struct buffer_head * | |
185 | affs_get_extblock(struct inode *inode, u32 ext) | |
186 | { | |
187 | /* inline the simplest case: same extended block as last time */ | |
188 | struct buffer_head *bh = AFFS_I(inode)->i_ext_bh; | |
189 | if (ext == AFFS_I(inode)->i_ext_last) | |
dca3c336 | 190 | get_bh(bh); |
1da177e4 LT |
191 | else |
192 | /* we have to do more (not inlined) */ | |
193 | bh = affs_get_extblock_slow(inode, ext); | |
194 | ||
195 | return bh; | |
196 | } | |
197 | ||
198 | static struct buffer_head * | |
199 | affs_get_extblock_slow(struct inode *inode, u32 ext) | |
200 | { | |
201 | struct super_block *sb = inode->i_sb; | |
202 | struct buffer_head *bh; | |
203 | u32 ext_key; | |
204 | u32 lc_idx, lc_off, ac_idx; | |
205 | u32 tmp, idx; | |
206 | ||
207 | if (ext == AFFS_I(inode)->i_ext_last + 1) { | |
208 | /* read the next extended block from the current one */ | |
209 | bh = AFFS_I(inode)->i_ext_bh; | |
210 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
211 | if (ext < AFFS_I(inode)->i_extcnt) | |
212 | goto read_ext; | |
213 | if (ext > AFFS_I(inode)->i_extcnt) | |
214 | BUG(); | |
215 | bh = affs_alloc_extblock(inode, bh, ext); | |
216 | if (IS_ERR(bh)) | |
217 | return bh; | |
218 | goto store_ext; | |
219 | } | |
220 | ||
221 | if (ext == 0) { | |
222 | /* we seek back to the file header block */ | |
223 | ext_key = inode->i_ino; | |
224 | goto read_ext; | |
225 | } | |
226 | ||
227 | if (ext >= AFFS_I(inode)->i_extcnt) { | |
228 | struct buffer_head *prev_bh; | |
229 | ||
230 | /* allocate a new extended block */ | |
231 | if (ext > AFFS_I(inode)->i_extcnt) | |
232 | BUG(); | |
233 | ||
234 | /* get previous extended block */ | |
235 | prev_bh = affs_get_extblock(inode, ext - 1); | |
236 | if (IS_ERR(prev_bh)) | |
237 | return prev_bh; | |
238 | bh = affs_alloc_extblock(inode, prev_bh, ext); | |
239 | affs_brelse(prev_bh); | |
240 | if (IS_ERR(bh)) | |
241 | return bh; | |
242 | goto store_ext; | |
243 | } | |
244 | ||
245 | again: | |
246 | /* check if there is an extended cache and whether it's large enough */ | |
247 | lc_idx = ext >> AFFS_I(inode)->i_lc_shift; | |
248 | lc_off = ext & AFFS_I(inode)->i_lc_mask; | |
249 | ||
250 | if (lc_idx >= AFFS_I(inode)->i_lc_size) { | |
251 | int err; | |
252 | ||
253 | err = affs_grow_extcache(inode, lc_idx); | |
254 | if (err) | |
255 | return ERR_PTR(err); | |
256 | goto again; | |
257 | } | |
258 | ||
259 | /* every n'th key we find in the linear cache */ | |
260 | if (!lc_off) { | |
261 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
262 | goto read_ext; | |
263 | } | |
264 | ||
265 | /* maybe it's still in the associative cache */ | |
266 | ac_idx = (ext - lc_idx - 1) & AFFS_AC_MASK; | |
267 | if (AFFS_I(inode)->i_ac[ac_idx].ext == ext) { | |
268 | ext_key = AFFS_I(inode)->i_ac[ac_idx].key; | |
269 | goto read_ext; | |
270 | } | |
271 | ||
272 | /* try to find one of the previous extended blocks */ | |
273 | tmp = ext; | |
274 | idx = ac_idx; | |
275 | while (--tmp, --lc_off > 0) { | |
276 | idx = (idx - 1) & AFFS_AC_MASK; | |
277 | if (AFFS_I(inode)->i_ac[idx].ext == tmp) { | |
278 | ext_key = AFFS_I(inode)->i_ac[idx].key; | |
279 | goto find_ext; | |
280 | } | |
281 | } | |
282 | ||
283 | /* fall back to the linear cache */ | |
284 | ext_key = AFFS_I(inode)->i_lc[lc_idx]; | |
285 | find_ext: | |
286 | /* read all extended blocks until we find the one we need */ | |
287 | //unlock cache | |
288 | do { | |
289 | bh = affs_bread(sb, ext_key); | |
290 | if (!bh) | |
291 | goto err_bread; | |
292 | ext_key = be32_to_cpu(AFFS_TAIL(sb, bh)->extension); | |
293 | affs_brelse(bh); | |
294 | tmp++; | |
295 | } while (tmp < ext); | |
296 | //lock cache | |
297 | ||
298 | /* store it in the associative cache */ | |
299 | // recalculate ac_idx? | |
300 | AFFS_I(inode)->i_ac[ac_idx].ext = ext; | |
301 | AFFS_I(inode)->i_ac[ac_idx].key = ext_key; | |
302 | ||
303 | read_ext: | |
304 | /* finally read the right extended block */ | |
305 | //unlock cache | |
306 | bh = affs_bread(sb, ext_key); | |
307 | if (!bh) | |
308 | goto err_bread; | |
309 | //lock cache | |
310 | ||
311 | store_ext: | |
312 | /* release old cached extended block and store the new one */ | |
313 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
314 | AFFS_I(inode)->i_ext_last = ext; | |
315 | AFFS_I(inode)->i_ext_bh = bh; | |
dca3c336 | 316 | get_bh(bh); |
1da177e4 LT |
317 | |
318 | return bh; | |
319 | ||
320 | err_bread: | |
321 | affs_brelse(bh); | |
322 | return ERR_PTR(-EIO); | |
323 | } | |
324 | ||
325 | static int | |
326 | affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) | |
327 | { | |
328 | struct super_block *sb = inode->i_sb; | |
329 | struct buffer_head *ext_bh; | |
330 | u32 ext; | |
331 | ||
332 | pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block); | |
333 | ||
8d4b6900 | 334 | BUG_ON(block > (sector_t)0x7fffffffUL); |
1da177e4 LT |
335 | |
336 | if (block >= AFFS_I(inode)->i_blkcnt) { | |
337 | if (block > AFFS_I(inode)->i_blkcnt || !create) | |
338 | goto err_big; | |
339 | } else | |
340 | create = 0; | |
341 | ||
342 | //lock cache | |
343 | affs_lock_ext(inode); | |
344 | ||
345 | ext = (u32)block / AFFS_SB(sb)->s_hashsize; | |
346 | block -= ext * AFFS_SB(sb)->s_hashsize; | |
347 | ext_bh = affs_get_extblock(inode, ext); | |
348 | if (IS_ERR(ext_bh)) | |
349 | goto err_ext; | |
350 | map_bh(bh_result, sb, (sector_t)be32_to_cpu(AFFS_BLOCK(sb, ext_bh, block))); | |
351 | ||
352 | if (create) { | |
353 | u32 blocknr = affs_alloc_block(inode, ext_bh->b_blocknr); | |
354 | if (!blocknr) | |
355 | goto err_alloc; | |
356 | set_buffer_new(bh_result); | |
357 | AFFS_I(inode)->mmu_private += AFFS_SB(sb)->s_data_blksize; | |
358 | AFFS_I(inode)->i_blkcnt++; | |
359 | ||
360 | /* store new block */ | |
361 | if (bh_result->b_blocknr) | |
362 | affs_warning(sb, "get_block", "block already set (%x)", bh_result->b_blocknr); | |
363 | AFFS_BLOCK(sb, ext_bh, block) = cpu_to_be32(blocknr); | |
364 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(block + 1); | |
365 | affs_adjust_checksum(ext_bh, blocknr - bh_result->b_blocknr + 1); | |
366 | bh_result->b_blocknr = blocknr; | |
367 | ||
368 | if (!block) { | |
369 | /* insert first block into header block */ | |
370 | u32 tmp = be32_to_cpu(AFFS_HEAD(ext_bh)->first_data); | |
371 | if (tmp) | |
372 | affs_warning(sb, "get_block", "first block already set (%d)", tmp); | |
373 | AFFS_HEAD(ext_bh)->first_data = cpu_to_be32(blocknr); | |
374 | affs_adjust_checksum(ext_bh, blocknr - tmp); | |
375 | } | |
376 | } | |
377 | ||
378 | affs_brelse(ext_bh); | |
379 | //unlock cache | |
380 | affs_unlock_ext(inode); | |
381 | return 0; | |
382 | ||
383 | err_big: | |
384 | affs_error(inode->i_sb,"get_block","strange block request %d", block); | |
385 | return -EIO; | |
386 | err_ext: | |
387 | // unlock cache | |
388 | affs_unlock_ext(inode); | |
389 | return PTR_ERR(ext_bh); | |
390 | err_alloc: | |
391 | brelse(ext_bh); | |
392 | clear_buffer_mapped(bh_result); | |
393 | bh_result->b_bdev = NULL; | |
394 | // unlock cache | |
395 | affs_unlock_ext(inode); | |
396 | return -ENOSPC; | |
397 | } | |
398 | ||
399 | static int affs_writepage(struct page *page, struct writeback_control *wbc) | |
400 | { | |
401 | return block_write_full_page(page, affs_get_block, wbc); | |
402 | } | |
f2b6a16e | 403 | |
1da177e4 LT |
404 | static int affs_readpage(struct file *file, struct page *page) |
405 | { | |
406 | return block_read_full_page(page, affs_get_block); | |
407 | } | |
f2b6a16e NP |
408 | |
409 | static int affs_write_begin(struct file *file, struct address_space *mapping, | |
410 | loff_t pos, unsigned len, unsigned flags, | |
411 | struct page **pagep, void **fsdata) | |
1da177e4 | 412 | { |
f2b6a16e NP |
413 | *pagep = NULL; |
414 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
415 | affs_get_block, | |
416 | &AFFS_I(mapping->host)->mmu_private); | |
1da177e4 | 417 | } |
f2b6a16e | 418 | |
1da177e4 LT |
419 | static sector_t _affs_bmap(struct address_space *mapping, sector_t block) |
420 | { | |
421 | return generic_block_bmap(mapping,block,affs_get_block); | |
422 | } | |
f2b6a16e | 423 | |
f5e54d6e | 424 | const struct address_space_operations affs_aops = { |
1da177e4 LT |
425 | .readpage = affs_readpage, |
426 | .writepage = affs_writepage, | |
427 | .sync_page = block_sync_page, | |
f2b6a16e NP |
428 | .write_begin = affs_write_begin, |
429 | .write_end = generic_write_end, | |
1da177e4 LT |
430 | .bmap = _affs_bmap |
431 | }; | |
432 | ||
433 | static inline struct buffer_head * | |
434 | affs_bread_ino(struct inode *inode, int block, int create) | |
435 | { | |
436 | struct buffer_head *bh, tmp_bh; | |
437 | int err; | |
438 | ||
439 | tmp_bh.b_state = 0; | |
440 | err = affs_get_block(inode, block, &tmp_bh, create); | |
441 | if (!err) { | |
442 | bh = affs_bread(inode->i_sb, tmp_bh.b_blocknr); | |
443 | if (bh) { | |
444 | bh->b_state |= tmp_bh.b_state; | |
445 | return bh; | |
446 | } | |
447 | err = -EIO; | |
448 | } | |
449 | return ERR_PTR(err); | |
450 | } | |
451 | ||
452 | static inline struct buffer_head * | |
453 | affs_getzeroblk_ino(struct inode *inode, int block) | |
454 | { | |
455 | struct buffer_head *bh, tmp_bh; | |
456 | int err; | |
457 | ||
458 | tmp_bh.b_state = 0; | |
459 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
460 | if (!err) { | |
461 | bh = affs_getzeroblk(inode->i_sb, tmp_bh.b_blocknr); | |
462 | if (bh) { | |
463 | bh->b_state |= tmp_bh.b_state; | |
464 | return bh; | |
465 | } | |
466 | err = -EIO; | |
467 | } | |
468 | return ERR_PTR(err); | |
469 | } | |
470 | ||
471 | static inline struct buffer_head * | |
472 | affs_getemptyblk_ino(struct inode *inode, int block) | |
473 | { | |
474 | struct buffer_head *bh, tmp_bh; | |
475 | int err; | |
476 | ||
477 | tmp_bh.b_state = 0; | |
478 | err = affs_get_block(inode, block, &tmp_bh, 1); | |
479 | if (!err) { | |
480 | bh = affs_getemptyblk(inode->i_sb, tmp_bh.b_blocknr); | |
481 | if (bh) { | |
482 | bh->b_state |= tmp_bh.b_state; | |
483 | return bh; | |
484 | } | |
485 | err = -EIO; | |
486 | } | |
487 | return ERR_PTR(err); | |
488 | } | |
489 | ||
1da177e4 LT |
490 | static int |
491 | affs_do_readpage_ofs(struct file *file, struct page *page, unsigned from, unsigned to) | |
492 | { | |
493 | struct inode *inode = page->mapping->host; | |
494 | struct super_block *sb = inode->i_sb; | |
495 | struct buffer_head *bh; | |
496 | char *data; | |
497 | u32 bidx, boff, bsize; | |
498 | u32 tmp; | |
499 | ||
500 | pr_debug("AFFS: read_page(%u, %ld, %d, %d)\n", (u32)inode->i_ino, page->index, from, to); | |
8d4b6900 | 501 | BUG_ON(from > to || to > PAGE_CACHE_SIZE); |
1da177e4 LT |
502 | kmap(page); |
503 | data = page_address(page); | |
504 | bsize = AFFS_SB(sb)->s_data_blksize; | |
505 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
506 | bidx = tmp / bsize; | |
507 | boff = tmp % bsize; | |
508 | ||
509 | while (from < to) { | |
510 | bh = affs_bread_ino(inode, bidx, 0); | |
511 | if (IS_ERR(bh)) | |
512 | return PTR_ERR(bh); | |
513 | tmp = min(bsize - boff, to - from); | |
8d4b6900 | 514 | BUG_ON(from + tmp > to || tmp > bsize); |
1da177e4 LT |
515 | memcpy(data + from, AFFS_DATA(bh) + boff, tmp); |
516 | affs_brelse(bh); | |
517 | bidx++; | |
518 | from += tmp; | |
519 | boff = 0; | |
520 | } | |
521 | flush_dcache_page(page); | |
522 | kunmap(page); | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static int | |
527 | affs_extent_file_ofs(struct inode *inode, u32 newsize) | |
528 | { | |
529 | struct super_block *sb = inode->i_sb; | |
530 | struct buffer_head *bh, *prev_bh; | |
531 | u32 bidx, boff; | |
532 | u32 size, bsize; | |
533 | u32 tmp; | |
534 | ||
535 | pr_debug("AFFS: extent_file(%u, %d)\n", (u32)inode->i_ino, newsize); | |
536 | bsize = AFFS_SB(sb)->s_data_blksize; | |
537 | bh = NULL; | |
538 | size = AFFS_I(inode)->mmu_private; | |
539 | bidx = size / bsize; | |
540 | boff = size % bsize; | |
541 | if (boff) { | |
542 | bh = affs_bread_ino(inode, bidx, 0); | |
543 | if (IS_ERR(bh)) | |
544 | return PTR_ERR(bh); | |
545 | tmp = min(bsize - boff, newsize - size); | |
8d4b6900 | 546 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
1da177e4 | 547 | memset(AFFS_DATA(bh) + boff, 0, tmp); |
6369a4ab | 548 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
1da177e4 LT |
549 | affs_fix_checksum(sb, bh); |
550 | mark_buffer_dirty_inode(bh, inode); | |
551 | size += tmp; | |
552 | bidx++; | |
553 | } else if (bidx) { | |
554 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
555 | if (IS_ERR(bh)) | |
556 | return PTR_ERR(bh); | |
557 | } | |
558 | ||
559 | while (size < newsize) { | |
560 | prev_bh = bh; | |
561 | bh = affs_getzeroblk_ino(inode, bidx); | |
562 | if (IS_ERR(bh)) | |
563 | goto out; | |
564 | tmp = min(bsize, newsize - size); | |
8d4b6900 | 565 | BUG_ON(tmp > bsize); |
1da177e4 LT |
566 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); |
567 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
568 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
569 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
570 | affs_fix_checksum(sb, bh); | |
571 | bh->b_state &= ~(1UL << BH_New); | |
572 | mark_buffer_dirty_inode(bh, inode); | |
573 | if (prev_bh) { | |
574 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
575 | if (tmp) | |
576 | affs_warning(sb, "extent_file_ofs", "next block already set for %d (%d)", bidx, tmp); | |
577 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
578 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
579 | mark_buffer_dirty_inode(prev_bh, inode); | |
580 | affs_brelse(prev_bh); | |
581 | } | |
582 | size += bsize; | |
583 | bidx++; | |
584 | } | |
585 | affs_brelse(bh); | |
586 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
587 | return 0; | |
588 | ||
589 | out: | |
590 | inode->i_size = AFFS_I(inode)->mmu_private = newsize; | |
591 | return PTR_ERR(bh); | |
592 | } | |
593 | ||
594 | static int | |
595 | affs_readpage_ofs(struct file *file, struct page *page) | |
596 | { | |
597 | struct inode *inode = page->mapping->host; | |
598 | u32 to; | |
599 | int err; | |
600 | ||
601 | pr_debug("AFFS: read_page(%u, %ld)\n", (u32)inode->i_ino, page->index); | |
602 | to = PAGE_CACHE_SIZE; | |
603 | if (((page->index + 1) << PAGE_CACHE_SHIFT) > inode->i_size) { | |
604 | to = inode->i_size & ~PAGE_CACHE_MASK; | |
605 | memset(page_address(page) + to, 0, PAGE_CACHE_SIZE - to); | |
606 | } | |
607 | ||
608 | err = affs_do_readpage_ofs(file, page, 0, to); | |
609 | if (!err) | |
610 | SetPageUptodate(page); | |
611 | unlock_page(page); | |
612 | return err; | |
613 | } | |
614 | ||
f2b6a16e NP |
615 | static int affs_write_begin_ofs(struct file *file, struct address_space *mapping, |
616 | loff_t pos, unsigned len, unsigned flags, | |
617 | struct page **pagep, void **fsdata) | |
1da177e4 | 618 | { |
f2b6a16e NP |
619 | struct inode *inode = mapping->host; |
620 | struct page *page; | |
621 | pgoff_t index; | |
1da177e4 LT |
622 | int err = 0; |
623 | ||
f2b6a16e NP |
624 | pr_debug("AFFS: write_begin(%u, %llu, %llu)\n", (u32)inode->i_ino, (unsigned long long)pos, (unsigned long long)pos + len); |
625 | if (pos > AFFS_I(inode)->mmu_private) { | |
626 | /* XXX: this probably leaves a too-big i_size in case of | |
627 | * failure. Should really be updating i_size at write_end time | |
628 | */ | |
629 | err = affs_extent_file_ofs(inode, pos); | |
1da177e4 LT |
630 | if (err) |
631 | return err; | |
632 | } | |
f2b6a16e NP |
633 | |
634 | index = pos >> PAGE_CACHE_SHIFT; | |
635 | page = __grab_cache_page(mapping, index); | |
636 | if (!page) | |
637 | return -ENOMEM; | |
638 | *pagep = page; | |
1da177e4 LT |
639 | |
640 | if (PageUptodate(page)) | |
641 | return 0; | |
642 | ||
f2b6a16e NP |
643 | /* XXX: inefficient but safe in the face of short writes */ |
644 | err = affs_do_readpage_ofs(file, page, 0, PAGE_CACHE_SIZE); | |
645 | if (err) { | |
646 | unlock_page(page); | |
647 | page_cache_release(page); | |
1da177e4 LT |
648 | } |
649 | return err; | |
650 | } | |
651 | ||
f2b6a16e NP |
652 | static int affs_write_end_ofs(struct file *file, struct address_space *mapping, |
653 | loff_t pos, unsigned len, unsigned copied, | |
654 | struct page *page, void *fsdata) | |
1da177e4 | 655 | { |
f2b6a16e | 656 | struct inode *inode = mapping->host; |
1da177e4 LT |
657 | struct super_block *sb = inode->i_sb; |
658 | struct buffer_head *bh, *prev_bh; | |
659 | char *data; | |
660 | u32 bidx, boff, bsize; | |
f2b6a16e | 661 | unsigned from, to; |
1da177e4 LT |
662 | u32 tmp; |
663 | int written; | |
664 | ||
f2b6a16e NP |
665 | from = pos & (PAGE_CACHE_SIZE - 1); |
666 | to = pos + len; | |
667 | /* | |
668 | * XXX: not sure if this can handle short copies (len < copied), but | |
669 | * we don't have to, because the page should always be uptodate here, | |
670 | * due to write_begin. | |
671 | */ | |
672 | ||
673 | pr_debug("AFFS: write_begin(%u, %llu, %llu)\n", (u32)inode->i_ino, (unsigned long long)pos, (unsigned long long)pos + len); | |
1da177e4 LT |
674 | bsize = AFFS_SB(sb)->s_data_blksize; |
675 | data = page_address(page); | |
676 | ||
677 | bh = NULL; | |
678 | written = 0; | |
679 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
680 | bidx = tmp / bsize; | |
681 | boff = tmp % bsize; | |
682 | if (boff) { | |
683 | bh = affs_bread_ino(inode, bidx, 0); | |
684 | if (IS_ERR(bh)) | |
685 | return PTR_ERR(bh); | |
686 | tmp = min(bsize - boff, to - from); | |
8d4b6900 | 687 | BUG_ON(boff + tmp > bsize || tmp > bsize); |
1da177e4 | 688 | memcpy(AFFS_DATA(bh) + boff, data + from, tmp); |
6369a4ab | 689 | be32_add_cpu(&AFFS_DATA_HEAD(bh)->size, tmp); |
1da177e4 LT |
690 | affs_fix_checksum(sb, bh); |
691 | mark_buffer_dirty_inode(bh, inode); | |
692 | written += tmp; | |
693 | from += tmp; | |
694 | bidx++; | |
695 | } else if (bidx) { | |
696 | bh = affs_bread_ino(inode, bidx - 1, 0); | |
697 | if (IS_ERR(bh)) | |
698 | return PTR_ERR(bh); | |
699 | } | |
700 | while (from + bsize <= to) { | |
701 | prev_bh = bh; | |
702 | bh = affs_getemptyblk_ino(inode, bidx); | |
703 | if (IS_ERR(bh)) | |
704 | goto out; | |
705 | memcpy(AFFS_DATA(bh), data + from, bsize); | |
706 | if (buffer_new(bh)) { | |
707 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
708 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
709 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
710 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(bsize); | |
711 | AFFS_DATA_HEAD(bh)->next = 0; | |
712 | bh->b_state &= ~(1UL << BH_New); | |
713 | if (prev_bh) { | |
714 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
715 | if (tmp) | |
716 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
717 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
718 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
719 | mark_buffer_dirty_inode(prev_bh, inode); | |
720 | } | |
721 | } | |
722 | affs_brelse(prev_bh); | |
723 | affs_fix_checksum(sb, bh); | |
724 | mark_buffer_dirty_inode(bh, inode); | |
725 | written += bsize; | |
726 | from += bsize; | |
727 | bidx++; | |
728 | } | |
729 | if (from < to) { | |
730 | prev_bh = bh; | |
731 | bh = affs_bread_ino(inode, bidx, 1); | |
732 | if (IS_ERR(bh)) | |
733 | goto out; | |
734 | tmp = min(bsize, to - from); | |
8d4b6900 | 735 | BUG_ON(tmp > bsize); |
1da177e4 LT |
736 | memcpy(AFFS_DATA(bh), data + from, tmp); |
737 | if (buffer_new(bh)) { | |
738 | AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA); | |
739 | AFFS_DATA_HEAD(bh)->key = cpu_to_be32(inode->i_ino); | |
740 | AFFS_DATA_HEAD(bh)->sequence = cpu_to_be32(bidx); | |
741 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
742 | AFFS_DATA_HEAD(bh)->next = 0; | |
743 | bh->b_state &= ~(1UL << BH_New); | |
744 | if (prev_bh) { | |
745 | u32 tmp = be32_to_cpu(AFFS_DATA_HEAD(prev_bh)->next); | |
746 | if (tmp) | |
747 | affs_warning(sb, "commit_write_ofs", "next block already set for %d (%d)", bidx, tmp); | |
748 | AFFS_DATA_HEAD(prev_bh)->next = cpu_to_be32(bh->b_blocknr); | |
749 | affs_adjust_checksum(prev_bh, bh->b_blocknr - tmp); | |
750 | mark_buffer_dirty_inode(prev_bh, inode); | |
751 | } | |
752 | } else if (be32_to_cpu(AFFS_DATA_HEAD(bh)->size) < tmp) | |
753 | AFFS_DATA_HEAD(bh)->size = cpu_to_be32(tmp); | |
754 | affs_brelse(prev_bh); | |
755 | affs_fix_checksum(sb, bh); | |
756 | mark_buffer_dirty_inode(bh, inode); | |
757 | written += tmp; | |
758 | from += tmp; | |
759 | bidx++; | |
760 | } | |
761 | SetPageUptodate(page); | |
762 | ||
763 | done: | |
764 | affs_brelse(bh); | |
765 | tmp = (page->index << PAGE_CACHE_SHIFT) + from; | |
766 | if (tmp > inode->i_size) | |
767 | inode->i_size = AFFS_I(inode)->mmu_private = tmp; | |
768 | ||
f2b6a16e NP |
769 | unlock_page(page); |
770 | page_cache_release(page); | |
771 | ||
1da177e4 LT |
772 | return written; |
773 | ||
774 | out: | |
775 | bh = prev_bh; | |
776 | if (!written) | |
777 | written = PTR_ERR(bh); | |
778 | goto done; | |
779 | } | |
780 | ||
f5e54d6e | 781 | const struct address_space_operations affs_aops_ofs = { |
1da177e4 LT |
782 | .readpage = affs_readpage_ofs, |
783 | //.writepage = affs_writepage_ofs, | |
784 | //.sync_page = affs_sync_page_ofs, | |
f2b6a16e NP |
785 | .write_begin = affs_write_begin_ofs, |
786 | .write_end = affs_write_end_ofs | |
1da177e4 LT |
787 | }; |
788 | ||
789 | /* Free any preallocated blocks. */ | |
790 | ||
791 | void | |
792 | affs_free_prealloc(struct inode *inode) | |
793 | { | |
794 | struct super_block *sb = inode->i_sb; | |
795 | ||
796 | pr_debug("AFFS: free_prealloc(ino=%lu)\n", inode->i_ino); | |
797 | ||
798 | while (AFFS_I(inode)->i_pa_cnt) { | |
799 | AFFS_I(inode)->i_pa_cnt--; | |
800 | affs_free_block(sb, ++AFFS_I(inode)->i_lastalloc); | |
801 | } | |
802 | } | |
803 | ||
804 | /* Truncate (or enlarge) a file to the requested size. */ | |
805 | ||
806 | void | |
807 | affs_truncate(struct inode *inode) | |
808 | { | |
809 | struct super_block *sb = inode->i_sb; | |
810 | u32 ext, ext_key; | |
811 | u32 last_blk, blkcnt, blk; | |
812 | u32 size; | |
813 | struct buffer_head *ext_bh; | |
814 | int i; | |
815 | ||
816 | pr_debug("AFFS: truncate(inode=%d, oldsize=%u, newsize=%u)\n", | |
817 | (u32)inode->i_ino, (u32)AFFS_I(inode)->mmu_private, (u32)inode->i_size); | |
818 | ||
819 | last_blk = 0; | |
820 | ext = 0; | |
821 | if (inode->i_size) { | |
822 | last_blk = ((u32)inode->i_size - 1) / AFFS_SB(sb)->s_data_blksize; | |
823 | ext = last_blk / AFFS_SB(sb)->s_hashsize; | |
824 | } | |
825 | ||
826 | if (inode->i_size > AFFS_I(inode)->mmu_private) { | |
827 | struct address_space *mapping = inode->i_mapping; | |
828 | struct page *page; | |
f2b6a16e NP |
829 | void *fsdata; |
830 | u32 size = inode->i_size; | |
1da177e4 LT |
831 | int res; |
832 | ||
f2b6a16e | 833 | res = mapping->a_ops->write_begin(NULL, mapping, size, 0, 0, &page, &fsdata); |
1da177e4 | 834 | if (!res) |
f2b6a16e | 835 | res = mapping->a_ops->write_end(NULL, mapping, size, 0, 0, page, fsdata); |
dca3c336 RZ |
836 | else |
837 | inode->i_size = AFFS_I(inode)->mmu_private; | |
1da177e4 LT |
838 | mark_inode_dirty(inode); |
839 | return; | |
840 | } else if (inode->i_size == AFFS_I(inode)->mmu_private) | |
841 | return; | |
842 | ||
843 | // lock cache | |
844 | ext_bh = affs_get_extblock(inode, ext); | |
845 | if (IS_ERR(ext_bh)) { | |
846 | affs_warning(sb, "truncate", "unexpected read error for ext block %u (%d)", | |
847 | ext, PTR_ERR(ext_bh)); | |
848 | return; | |
849 | } | |
850 | if (AFFS_I(inode)->i_lc) { | |
851 | /* clear linear cache */ | |
852 | i = (ext + 1) >> AFFS_I(inode)->i_lc_shift; | |
853 | if (AFFS_I(inode)->i_lc_size > i) { | |
854 | AFFS_I(inode)->i_lc_size = i; | |
855 | for (; i < AFFS_LC_SIZE; i++) | |
856 | AFFS_I(inode)->i_lc[i] = 0; | |
857 | } | |
858 | /* clear associative cache */ | |
859 | for (i = 0; i < AFFS_AC_SIZE; i++) | |
860 | if (AFFS_I(inode)->i_ac[i].ext >= ext) | |
861 | AFFS_I(inode)->i_ac[i].ext = 0; | |
862 | } | |
863 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
864 | ||
865 | blkcnt = AFFS_I(inode)->i_blkcnt; | |
866 | i = 0; | |
867 | blk = last_blk; | |
868 | if (inode->i_size) { | |
869 | i = last_blk % AFFS_SB(sb)->s_hashsize + 1; | |
870 | blk++; | |
871 | } else | |
872 | AFFS_HEAD(ext_bh)->first_data = 0; | |
dca3c336 | 873 | AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i); |
1da177e4 LT |
874 | size = AFFS_SB(sb)->s_hashsize; |
875 | if (size > blkcnt - blk + i) | |
876 | size = blkcnt - blk + i; | |
877 | for (; i < size; i++, blk++) { | |
878 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
879 | AFFS_BLOCK(sb, ext_bh, i) = 0; | |
880 | } | |
881 | AFFS_TAIL(sb, ext_bh)->extension = 0; | |
882 | affs_fix_checksum(sb, ext_bh); | |
883 | mark_buffer_dirty_inode(ext_bh, inode); | |
884 | affs_brelse(ext_bh); | |
885 | ||
886 | if (inode->i_size) { | |
887 | AFFS_I(inode)->i_blkcnt = last_blk + 1; | |
888 | AFFS_I(inode)->i_extcnt = ext + 1; | |
889 | if (AFFS_SB(sb)->s_flags & SF_OFS) { | |
890 | struct buffer_head *bh = affs_bread_ino(inode, last_blk, 0); | |
891 | u32 tmp; | |
892 | if (IS_ERR(ext_bh)) { | |
893 | affs_warning(sb, "truncate", "unexpected read error for last block %u (%d)", | |
894 | ext, PTR_ERR(ext_bh)); | |
895 | return; | |
896 | } | |
897 | tmp = be32_to_cpu(AFFS_DATA_HEAD(bh)->next); | |
898 | AFFS_DATA_HEAD(bh)->next = 0; | |
899 | affs_adjust_checksum(bh, -tmp); | |
900 | affs_brelse(bh); | |
901 | } | |
902 | } else { | |
903 | AFFS_I(inode)->i_blkcnt = 0; | |
904 | AFFS_I(inode)->i_extcnt = 1; | |
905 | } | |
906 | AFFS_I(inode)->mmu_private = inode->i_size; | |
907 | // unlock cache | |
908 | ||
909 | while (ext_key) { | |
910 | ext_bh = affs_bread(sb, ext_key); | |
911 | size = AFFS_SB(sb)->s_hashsize; | |
912 | if (size > blkcnt - blk) | |
913 | size = blkcnt - blk; | |
914 | for (i = 0; i < size; i++, blk++) | |
915 | affs_free_block(sb, be32_to_cpu(AFFS_BLOCK(sb, ext_bh, i))); | |
916 | affs_free_block(sb, ext_key); | |
917 | ext_key = be32_to_cpu(AFFS_TAIL(sb, ext_bh)->extension); | |
918 | affs_brelse(ext_bh); | |
919 | } | |
920 | affs_free_prealloc(inode); | |
921 | } |